Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
Fork of mbed-dev by
targets/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c
- Committer:
- <>
- Date:
- 2016-10-28
- Revision:
- 149:156823d33999
- Parent:
- targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@ 144:ef7eb2e8f9f7
- Child:
- 150:02e0a0aed4ec
File content as of revision 149:156823d33999:
/***************************************************************************//** * @file sleep.c ******************************************************************************* * @section License * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> ******************************************************************************* * * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ******************************************************************************/ #include "device.h" #if DEVICE_SLEEP #include "sleep_api.h" #include "sleepmodes.h" #include "cmsis.h" #include "em_emu.h" #include "critical.h" uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0}; /** * Sleep mode. * Enter the lowest possible sleep mode that is not blocked by ongoing activity. */ void sleep(void) { if (sleep_block_counter[0] > 0) { /* Blocked everything below EM0, so just return */ return; } else if (sleep_block_counter[1] > 0) { /* Blocked everything below EM1, enter EM1 */ EMU_EnterEM1(); } else if (sleep_block_counter[2] > 0) { /* Blocked everything below EM2, enter EM2 */ EMU_EnterEM2(true); } else { /* Blocked everything below EM3, enter EM3 */ EMU_EnterEM3(true); } /* Never enter EM4, as mbed has no way of configuring EM4 wakeup */ return; } /** * Deep Sleep mode. * Enter Energy Mode 2, turning off all high-frequency clocks. * * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER, * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still * available. This gives a high degree of autonomous operation with a current * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out * Detection and full RAM and CPU retention is also included. */ void deepsleep(void) { EMU_EnterEM2(true); } /** Block the microcontroller from sleeping below a certain mode * * This will block sleep() from entering an energy mode below the one given. * -- To be called by peripheral HAL's -- * * After the peripheral is finished with the operation, it should call unblock with the same state * */ void blockSleepMode(sleepstate_enum minimumMode) { core_util_critical_section_enter(); sleep_block_counter[minimumMode]++; core_util_critical_section_exit(); } /** Unblock the microcontroller from sleeping below a certain mode * * This will unblock sleep() from entering an energy mode below the one given. * -- To be called by peripheral HAL's -- * * This should be called after all transactions on a peripheral are done. */ void unblockSleepMode(sleepstate_enum minimumMode) { core_util_critical_section_enter(); if(sleep_block_counter[minimumMode] > 0) { sleep_block_counter[minimumMode]--; } core_util_critical_section_exit(); } #endif